Wireless power transfer system, control method of wireless power transfer system, wireless power transmitting apparatus, control method of wireless power transmitting apparatus, and storage medium

ABSTRACT

A wireless power transfer system comprising a wireless power transmitting apparatus and a plurality of wireless power receiving apparatuses, the wireless power transmitting apparatus comprising: a power transmitting unit adapted to transmit power to the wireless power receiving apparatus; a recognition unit adapted to recognize the wireless power receiving apparatus; and a transmitting unit adapted to transmit predetermined charging delay information according to a recognition result of the recognition unit to the wireless power receiving apparatus recognized by the recognition unit, and the wireless power receiving apparatus comprising: a power receiving unit adapted to receive power transmitted from the power transmitting unit; a receiving unit adapted to receive the predetermined charging delay information transmitted from the transmitting unit; and a display unit adapted to make a display based on the predetermined charging delay information received by the receiving unit.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a wireless power transfer system for aplurality of apparatuses, a control method of the wireless powertransfer system, a wireless power transmitting apparatus, a controlmethod of the wireless power transmitting apparatus, and a storagemedium.

2. Description of the Related Art

In recent years, apparatuses such as cellular phones which userechargeable batteries are popularly used. A system for charging arechargeable battery is configured by a primary-side apparatus whichtransmits power to the rechargeable battery, and a secondary-sideapparatus which receives power.

In such a charging system, a technique for displaying a charging stateof a rechargeable battery on the primary side is available (JapanesePatent Laid-Open No. 8-019189). Also, a technique for displaying acharging state of a rechargeable battery on a secondary-side apparatusis available (Japanese Patent Laid-Open No. 7-241045).

Furthermore, a technique for transferring power to a plurality ofapparatuses using electromagnetic induction or electromagnetic resonanceis available (Japanese Patent Laid-Open No. 2008-017592, U.S. PatentApplication Publication No. 2009/0140690). Moreover, a wireless powertransfer technique, which communicates so as to supply power to asecondary-side apparatus that uses a different voltage or current, isavailable (Japanese Patent Laid-Open No. 6-133476).

However, in a wireless charging system which can wirelessly charge aplurality of secondary-side apparatuses, the power transmittingcapability of a primary-side apparatus has an upper limit specified bythat wireless charging system.

On the other hand, in the wireless charging system, a restriction aboutthe position of the secondary-side apparatus during charge is relativelymoderate because the primary-side apparatus and secondary-side apparatusneed not be connected. For this reason, there is a case that apredetermined number or more of secondary-side apparatuses are locatedwithin a wirelessly chargeable region and not charged wirelessly overthe power transmitting capability of the primary-side apparatus.

In this case, the following phenomena may occur. That is, the chargingtimes of the respective secondary-side apparatuses may be prolonged, anda specific secondary-side apparatus may not be charged. However, withthe conventional technique, since the user does not receive anyinformation indicating that such phenomena have occurred, he or shecannot judge whether or not the phenomena have occurred due to a troubleof the primary-side apparatus or secondary-side apparatus.

When a secondary-side apparatus of a electromagnetic resonance system isset to be closer to a primary-side apparatus of an electromagneticinduction system, since their wireless power transfer systems aredifferent, the primary-side apparatus never transmits power to thesecondary-side apparatus. The user is not able to judge whether aspecific secondary-side apparatus cannot receive power due to adifferent wireless power transfer system or it cannot receive powersince the power transmitting capability of the primary-side apparatusdoes not wirelessly charge that apparatus.

The present invention provides, in consideration of the above problems,a technique which allows the user to recognize the reasons why acharging time delay phenomenon and a non-charging phenomenon haveoccurred at the time of wireless power transfer.

SUMMARY OF THE INVENTION

According to one aspect of the present invention, there is provided awireless power transfer system comprising a wireless power transmittingapparatus and a plurality of wireless power receiving apparatuses, thewireless power transmitting apparatus comprising: a power transmittingunit adapted to transmit power to the wireless power receivingapparatus; a recognition unit adapted to recognize the wireless powerreceiving apparatus; and a transmitting unit adapted to transmitpredetermined charging delay information according to a recognitionresult of the recognition unit to the wireless power receiving apparatusrecognized by the recognition unit, and the wireless power receivingapparatus comprising: a power receiving unit adapted to receive powertransmitted from the power transmitting unit; a receiving unit adaptedto receive the predetermined charging delay information transmitted fromthe transmitting unit; and a display unit adapted to make a displaybased on the predetermined charging delay information received by thereceiving unit.

According to one aspect of the present invention, there is provided acontrol method of a wireless power transfer system comprising a wirelesspower transmitting apparatus and a wireless power receiving apparatus,the method comprising: in the wireless power transmitting apparatus,transmitting power to the wireless power receiving apparatus;recognizing the wireless power receiving apparatus; and transmittingpredetermined charging delay information according to a recognitionresult in the recognizing to the wireless power receiving apparatus, andin the wireless power receiving apparatus, receiving power transmittedin the transmitting power; receiving the predetermined charging delayinformation transmitted in the transmitting; and making a display basedon the predetermined charging delay information received in thereceiving.

According to one aspect of the present invention, there is provided awireless power transmitting apparatus for transmitting power to awireless power receiving apparatus, comprising: a power transmittingunit adapted to transmit power to the wireless power receivingapparatus; a recognition unit adapted to recognize the wireless powerreceiving apparatus; and a transmitting unit adapted to transmitpredetermined charging delay information according to a recognitionresult of the recognition unit to the wireless power receivingapparatus.

According to one aspect of the present invention, there is provided acontrol method of a wireless power transmitting apparatus fortransmitting power to a wireless power receiving apparatus, comprising:transmitting power to the wireless power receiving apparatus;recognizing the wireless power receiving apparatus; and transmittingpredetermined charging delay information according to a recognitionresult in the recognizing to the wireless power receiving apparatus.

Further features of the present invention will be apparent from thefollowing description of exemplary embodiments with reference to theattached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view showing the configuration of a wireless power transfersystem according to the first embodiment;

FIG. 2 is a block diagram showing the arrangement of a primary-sideapparatus according to the first embodiment;

FIG. 3 is a block diagram showing the arrangement of a secondary-sideapparatus according to the first embodiment;

FIG. 4 is a flowchart for explaining processing of a primary-sidecontrol unit in association with charging according to the firstembodiment;

FIG. 5 is a view showing first output contents according to the firstembodiment;

FIG. 6 is a view showing second output contents according to the firstembodiment;

FIG. 7 is a block diagram showing the arrangement of a primary-sideapparatus according to the second embodiment;

FIG. 8 is a block diagram showing the arrangement of a secondary-sideapparatus according to the second embodiment;

FIG. 9 is a flowchart for explaining processing of a primary-sidecontrol unit in association with charging according to the secondembodiment;

FIG. 10 is a view showing output contents according to the secondembodiment;

FIG. 11 is a block diagram showing the arrangement of a primary-sideapparatus according to the third embodiment;

FIG. 12 is a flowchart for explaining processing of a primary-sidecontrol unit in association with charging according to the thirdembodiment;

FIG. 13 is a view showing first output contents according to the thirdembodiment;

FIG. 14 is a view showing second output contents according to the thirdembodiment; and

FIG. 15 is a view showing third output contents according to the thirdembodiment.

DESCRIPTION OF THE EMBODIMENTS

An exemplary embodiment(s) of the present invention will now bedescribed in detail with reference to the drawings. It should be notedthat the relative arrangement of the components, the numericalexpressions and numerical values set forth in these embodiments do notlimit the scope of the present invention unless it is specificallystated otherwise.

First Embodiment

The configuration of a wireless power transfer system according to thefirst embodiment will be described below with reference to FIG. 1.

FIG. 1 shows a primary-side apparatus 10 (wireless power transmittingapparatus 10), a secondary-side apparatus 20 (wireless power receivingapparatus), and a secondary-side apparatus 30 (second wireless powerreceiving apparatus). The primary-side apparatus 10 supplies power tothe secondary-side apparatuses 20 and 30.

The arrangement of the primary-side apparatus 10 will be described belowwith reference to FIG. 2. The primary-side apparatus 10 includes a powerplug 101, power rectifying unit 102, power transmitting unit 103,primary-side coil 104, primary-side communication unit 105, primary-sideantenna 106, and primary-side control unit 107. The power plug 101 isthat which is connected to an outlet of an AC power supply. The powerrectifying unit 102 rectifies electricity supplied from the power plug101. The power transmitting unit 103 transmits the electricity rectifiedby the power rectifying unit 102. The primary-side coil 104 is that forthe power transmitting unit 103. The primary-side communication unit 105makes a data communication. The primary-side antenna 106 is that for theprimary-side communication unit 105. The primary-side control unit 107controls the power transmitting unit 103 and primary-side communicationunit 105.

The arrangement of the secondary-side apparatus 20 will be describedbelow with reference to FIG. 3. The secondary-side apparatus 20 includesa secondary-side coil 201, power receiving unit 202, rechargeablebattery 203, charging processing unit 204, secondary-side communicationunit 205, secondary-side antenna 206, display unit 207, andsecondary-side control unit 208. Note that the arrangement of thesecondary-side apparatus 30 is the same as that of the secondary-sideapparatus 20.

The secondary-side coil 201 receives electricity transmitted from theprimary-side coil 104. The power receiving unit 202 receives theelectricity from the secondary-side coil 201. The rechargeable battery203 is that to be charged. The charging processing unit 204 supplies theelectricity received by the power receiving unit 202 to the rechargeablebattery 203. The secondary-side communication unit 205 makes a datacommunication. The secondary-side antenna 206 is that for thesecondary-side communication unit 205. The display unit 207 displaysinformation. The secondary-side control unit 208 controls the powerreceiving unit 202, secondary-side communication unit 205, and displayunit 207.

The operation of the primary-side control unit 107 in association withcharging by this charging system will be described below with referenceto the flowchart of FIG. 4.

The primary-side control unit 107 determines in step S401 whether or nota new secondary-side apparatus is recognized. If it is determined that anew secondary-side apparatus is recognized (step S401; YES), the processadvances to step S402 according to that recognition result. On the otherhand, if it is determined that a new secondary-side apparatus is notrecognized (step S401; NO), the process returns to step S401 accordingto that recognition result.

The primary-side control unit 107 determines in step S402 whether or notthere is another secondary-side apparatus which is already beingcharged. If it is determined that there is the other secondary-sideapparatus which is already being charged (step S402; YES), the processadvances to step S403. On the other hand, if it is determined there isno secondary-side apparatus which is already being charged (step S402;NO), the process advances to step S404.

In step S403, the primary-side control unit 107 controls theprimary-side communication unit 105 to transmit predeterminedinformation to the secondary-side apparatus via the primary-side antenna106. In the secondary-side apparatus, the secondary-side control unit208 controls the secondary-side communication unit 205 to receive, viathe secondary-side antenna 206, the predetermined informationtransmitted from the primary-side apparatus 10. Then, the secondary-sidecontrol unit 208 controls the display unit 207 according to thedetermination result in step S402 to display power reception waitinginformation indicating that the apparatus is waiting until it startspower reception.

In step S404, the primary-side control unit 107 controls theprimary-side communication unit 105 to transmit predeterminedinformation to the secondary-side apparatus via the primary-side antenna106. The primary-side control unit 107 controls the power transmittingunit 103 to transmit power to the secondary-side apparatus via theprimary-side coil 104. Then, in the secondary-side apparatus, thesecondary-side control unit 208 controls the secondary-sidecommunication unit 205 to receive, via the secondary-side antenna 206,the predetermined information transmitted from the primary-sideapparatus 10. When power is transmitted from the primary-side apparatus10 to the secondary-side apparatus, the power receiving unit 202receives power via the secondary-side coil 201. Then, the chargingprocessing unit 204 accumulates the received electricity in therechargeable battery 203. The secondary-side control unit 208 controlsthe display unit 207 to display information indicating that charging isin progress.

In this way, the processing ends. As shown in FIG. 5, when thesecondary-side apparatus 20 alone is placed on a chargeable region ofthe primary-side apparatus 10, information indicating that charging isin progress is displayed on the secondary-side apparatus 20, and thesecondary-side apparatus 20 is charged. From this state, when thesecondary-side apparatus 30 is placed on the chargeable region of theprimary-side apparatus 10, information indicating that the apparatus iswaiting for charging is displayed on the secondary-side apparatus 30, asshown in FIG. 6.

According to this embodiment, the user of the secondary-side apparatus30 can know the reason why the apparatus 30 is not charged, thusimproving the convenience.

Second Embodiment

The configuration of a charging system according to the secondembodiment is the same as that shown in FIG. 1 described in the firstembodiment.

The arrangement of a primary-side apparatus 10 according to the secondembodiment will be described below with reference to FIG. 7. Theprimary-side apparatus 10 includes a power plug 701, power rectifyingunit 702, power transmitting communication unit 703, primary-sidecoil/antenna 704, and primary-side control unit 705. The power plug 701is that which is connected to an outlet of an AC power supply. The powerrectifying unit 702 rectifies electricity supplied from the power plug701. The power transmitting communication unit 703 transmits theelectricity rectified by the power rectifying unit 702 to asecondary-side apparatus, and also makes a data communication. Theprimary-side coil/antenna 704 is that for the power transmittingcommunication unit 703. The primary-side control unit 705 controls thepower transmitting communication unit 703.

The arrangement of a secondary-side apparatus 20 will be described belowwith reference to FIG. 8. The secondary-side apparatus 20 includes asecondary-side coil/antenna 801, power receiving communication unit 802,rechargeable battery 803, charging processing unit 804, display unit805, and secondary-side control unit 806. Note that the arrangement of asecondary-side apparatus 30 is the same as that of the secondary-sideapparatus 20.

The secondary-side coil/antenna 801 is that which receives theelectricity and predetermined information transmitted from theprimary-side coil/antenna 704. The power receiving communication unit802 receives the electricity transmitted from the secondary-sidecoil/antenna 801, and also makes a data communication. The rechargeablebattery 803 is that to be charged. The charging processing unit 804supplies the electricity received by the power receiving communicationunit 802 to the rechargeable battery 803. The display unit 805 displaysinformation. The secondary-side control unit 806 controls the powerreceiving communication unit 802 and display unit 805. The operation ofthe primary-side control unit 705 in association with charging by thischarging system will be described below with reference to the flowchartshown in FIG. 9.

The primary-side control unit 705 determines in step S901 whether or nota new secondary-side apparatus is recognized. If it is determined that anew secondary-side apparatus is recognized (step S901; YES), the processadvances to step S902. On the other hand, if it is determined that a newsecondary-side apparatus is not recognized (step S901; NO), the processreturns to step S901.

In step S902, the primary-side control unit 705 updates the number ofcharging secondary-side apparatuses.

In the example shown in FIG. 1, the number of charging apparatuses is 1.

Next, the primary-side control unit 705 determines in step S903 whetheror not the number of charging apparatuses is 2 or more. If it isdetermined that the number of charging apparatuses is 2 or more (stepS903; YES), the process advances to step S904. On the other hand, if itis determined that the number of charging apparatuses is less than 2(step S903; NO), the process advances to step S905.

In step S904, the primary-side control unit 705 controls the powertransmitting communication unit 703 to transmit predeterminedinformation to the secondary-side apparatus via the primary-sidecoil/antenna 704. Then, in the secondary-side apparatus, thesecondary-side control unit 806 controls the power receivingcommunication unit 802 to receive the predetermined informationtransmitted from the primary-side apparatus 10 via the secondary-sidecoil/antenna 801.

Also, the primary-side control unit 705 controls the power transmittingcommunication unit 703 to transmit power to the secondary-side apparatusvia the primary-side coil/antenna 704. When power is transmitted fromthe primary-side apparatus 10 to the secondary-side apparatus, the powerreceiving communication unit 802 receives the power via thesecondary-side coil/antenna 801. Then, the charging processing unit 804accumulates the received electricity in the rechargeable battery 803.The secondary-side control unit 806 controls the display unit 805 todisplay information indicating the number of charging apparatuses, andinformation indicating that a charging time will be prolonged due tosimultaneous charging.

In step S905, the primary-side control unit 705 controls the powertransmitting communication unit 703 to transmit predeterminedinformation to the secondary-side apparatus via the primary-sidecoil/antenna 704. Also, the primary-side control unit 705 controls thepower transmitting communication unit 703 to transmit power to thesecondary-side apparatus via the primary-side coil/antenna 704. Then, inthe secondary-side apparatus, the secondary-side control unit 806controls the power receiving communication unit 802 to receive, via thesecondary-side coil/antenna 801, the predetermined informationtransmitted from the primary-side apparatus 10. When power istransmitted from the primary-side apparatus 10 to the secondary-sideapparatus, the power receiving communication unit 802 receives the powervia the secondary-side coil/antenna 801. Then, the secondary-sidecontrol unit 806 controls the display unit 805 to display informationindicating that charging is in progress.

In this way, the processing ends. As shown in FIG. 5, when thesecondary-side apparatus 20 alone is placed on a chargeable region ofthe primary-side apparatus 10, information indicating that charging isin progress is displayed on the secondary-side apparatus 20, and thesecondary-side apparatus 20 is charged. From this state, when thesecondary-side apparatus 30 is placed on the chargeable region of theprimary-side apparatus 10, information indicating that the charging timewill be prolonged since two apparatuses are simultaneously being chargedis displayed on the secondary-side apparatuses 20 and 30, as shown inFIG. 10. Note that an estimated time required until completion ofcharging may be further displayed.

According to this embodiment, the users of the secondary-sideapparatuses 20 and 30 can know the number of a plurality ofsecondary-side apparatuses which are being charged simultaneously andinformation indicating that the charging time will be prolonged, thusimproving the convenience.

Third Embodiment

The configuration of a charging system according to the third embodimentis the same as that shown in FIG. 1 described in the first embodiment.Also, the arrangement of a secondary-side apparatus according to thethird embodiment is the same as that shown in FIG. 3 described in thefirst embodiment.

The arrangement of a primary-side apparatus 10 according to the thirdembodiment will be described below with reference to FIG. 11. Theprimary-side apparatus 10 includes a power plug 1101, power rectifyingunit 1102, power transmitting unit 1103, primary-side coil 1104,primary-side communication unit 1105, primary-side antenna 1106, outputunit 1107, and primary-side control unit 1108.

The power plug 1101 is that which is connected to an outlet of an ACpower supply. The power rectifying unit 1102 rectifies electricitysupplied from the power plug 1101. The power transmitting unit 1103transmits the electricity rectified by the power rectifying unit 1102.The primary-side coil 1104 is that for the power transmitting unit 1103.The primary-side communication unit 1105 makes a data communication. Theprimary-side antenna 1106 is that for the primary-side communicationunit 1105. The output unit 1107 outputs information. The primary-sidecontrol unit 1108 controls the power transmitting unit 1103,primary-side communication unit 1105, and output unit 1107.

The operation of the primary-side control unit 1108 in association withcharging by this charging system will be described below with referenceto the flowchart of FIG. 12. The primary-side control unit 1108determines in step S1201 whether or not a new secondary-side apparatusis recognized. If it is determined that a new secondary-side apparatusis recognized (step S1201; YES), the process advances to step S1202. Onthe other hand, if it is determined that a new secondary-side apparatusis not recognized (step S1201; NO), the process returns to step S1201.

The primary-side control unit 1108 determines in step S1202 whether ornot there is another secondary-side apparatus which is already beingcharged. If it is determined that there is the other secondary-sideapparatus which is already being charged (step S1202; YES), the processadvances to step S1204. On the other hand, if it is determined there isno secondary-side apparatus which is already being charged (step S1202;NO), the process advances to step S1203.

In step S1203, the primary-side control unit 1108 controls theprimary-side communication unit 1105 to transmit predeterminedinformation to the secondary-side apparatus via the primary-side antenna1106. The primary-side control unit 1108 controls the power transmittingunit 1103 to transmit power to the secondary-side apparatus via theprimary-side coil 1104. Then, in the secondary-side apparatus, asecondary-side control unit 208 controls a secondary-side communicationunit 205 to receive, via a secondary-side antenna 206, the predeterminedinformation transmitted from the primary-side apparatus 10. When poweris transmitted from the primary-side apparatus 10 to the secondary-sideapparatus, a power receiving unit 202 receives power via asecondary-side coil 201. Then, a charging processing unit 204accumulates the received electricity in a rechargeable battery 203. Thesecondary-side control unit 208 controls a display unit 207 to displayinformation indicating that charging is in progress. Upon completion ofthe processing in step S1203, the process advances to step S1206.

In step S1204, the primary-side control unit 1108 updates the number ofcharging waiting apparatuses.

In step S1205, the primary-side control unit 1108 controls theprimary-side communication unit 1105 to transmit predeterminedinformation to the secondary-side apparatus via the primary-side antenna1106. In the secondary-side apparatus, the secondary-side control unit208 controls the secondary-side communication unit 205 to receive, viathe secondary-side antenna 206, the predetermined informationtransmitted from the primary-side apparatus 10. Then, the secondary-sidecontrol unit 208 controls the display unit 207 to display informationindicating the number of charging waiting apparatuses.

In step S1206, the primary-side control unit 1108 controls the outputunit 1107 to output pieces of information of the respectivesecondary-side apparatuses (second display processing).

In this way, the processing ends.

With the above processing, as shown in FIG. 13, when a secondary-sideapparatus 20 alone is placed on a chargeable region of the primary-sideapparatus 10, information indicating that charging is in progress isdisplayed on the secondary-side apparatus 20, and the secondary-sideapparatus 20 is charged. Also, information indicating that charging ofone apparatus is in progress is displayed on the primary-side apparatus10. From this state, when a secondary-side apparatus 30 is furtherplaced on the chargeable region of the primary-side apparatus 10,information indicating that the apparatus is waiting for charging andinformation indicating the number of waiting apparatuses is 1 aredisplayed on the secondary-side apparatus 30, as shown in FIG. 14.Furthermore, from this state as shown in FIG. 15, when a secondary-sideapparatus 40 having a different charging system is placed on thechargeable region of the primary-side apparatus 10, no information isdisplayed on the secondary-side apparatus 40, and the display contentsof the primary-side apparatus remain unchanged.

According to this embodiment, the user of the charging system canrecognize charging statuses, thus improving the convenience.

According to the present invention, the user can recognize reasons why acharging time delay phenomenon and a non-charging phenomenon haveoccurred at the time of wireless power transfer.

Other Embodiments

Aspects of the present invention can also be realized by a computer of asystem or apparatus (or devices such as a CPU or MPU) that reads out andexecutes a program recorded on a memory device to perform the functionsof the above-described embodiment(s), and by a method, the steps ofwhich are performed by a computer of a system or apparatus by, forexample, reading out and executing a program recorded on a memory deviceto perform the functions of the above-described embodiment(s). For thispurpose, the program is provided to the computer for example via anetwork or from a recording medium of various types serving as thememory device (for example, computer-readable storage medium).

While the present invention has been described with reference toexemplary embodiments, it is to be understood that the invention is notlimited to the disclosed exemplary embodiments. The scope of thefollowing claims is to be accorded the broadest interpretation so as toencompass all such modifications and equivalent structures andfunctions.

This application claims the benefit of Japanese Patent Application No.2010-247842 filed on Nov. 4, 2010, which is hereby incorporated byreference herein in its entirety.

1. A wireless power transfer system comprising a wireless powertransmitting apparatus and a plurality of wireless power receivingapparatuses, said wireless power transmitting apparatus comprising: apower transmitting unit adapted to transmit power to the wireless powerreceiving apparatus; a recognition unit adapted to recognize thewireless power receiving apparatus; and a transmitting unit adapted totransmit predetermined charging delay information according to arecognition result of said recognition unit to the wireless powerreceiving apparatus recognized by said recognition unit, and saidwireless power receiving apparatus comprising: a power receiving unitadapted to receive power transmitted from said power transmitting unit;a receiving unit adapted to receive the predetermined charging delayinformation transmitted from said transmitting unit; and a display unitadapted to make a display based on the predetermined charging delayinformation received by said receiving unit.
 2. The system according toclaim 1, wherein said wireless power transmitting apparatus furthercomprises: a determination unit adapted to determine, when saidrecognition unit recognizes a new wireless power receiving apparatus,whether or not there is a wireless power receiving apparatus which hasalready received power transmitted from said power transmitting unit. 3.The system according to claim 2, wherein when said determination unitdetermines that there is the wireless power receiving apparatus whichhas already received power transmitted from said power transmittingunit, said transmitting unit transmits the predetermined charging delayinformation indicating that said wireless power receiving apparatus iswaiting until power reception is started.
 4. The system according toclaim 1, wherein the predetermined charging delay information includesinformation indicating the number of wireless power receivingapparatuses which are waiting for power reception.
 5. The systemaccording to claim 1, wherein the predetermined charging delayinformation includes information indicating an estimated time until saidwireless power transmitting apparatus starts power transmission.
 6. Thesystem according to claim 2, wherein when said determination unitdetermines that there is the wireless power receiving apparatus whichhas already received power transmitted from said power transmittingunit, said transmitting unit transmits the predetermined charging delayinformation indicating that a plurality of wireless power receivingapparatuses are simultaneously receiving power.
 7. The system accordingto claim 1, wherein the predetermined charging delay informationincludes information indicating that a time required until completion ofcharging will be prolonged since a plurality of wireless power receivingapparatuses are simultaneously receiving power.
 8. The system accordingto claim 1, wherein the predetermined charging delay informationincludes information indicating the number of wireless power receivingapparatuses which are simultaneously receiving power.
 9. The systemaccording to claim 1, wherein said wireless power transmitting apparatusfurther comprises: a second display unit adapted to make a display basedon the predetermined charging delay information.
 10. A control method ofa wireless power transfer system comprising a wireless powertransmitting apparatus and a wireless power receiving apparatus, themethod comprising: in the wireless power transmitting apparatus,transmitting power to the wireless power receiving apparatus;recognizing the wireless power receiving apparatus; and transmittingpredetermined charging delay information according to a recognitionresult in the recognizing to the wireless power receiving apparatus, andin the wireless power receiving apparatus, receiving power transmittedin the transmitting power; receiving the predetermined charging delayinformation transmitted in the transmitting; and making a display basedon the predetermined charging delay information received in thereceiving.
 11. A computer-readable non-transitory storage medium storinga computer program for controlling a computer to execute respectivesteps of a control method of a wireless power transfer system of claim10.
 12. A wireless power transmitting apparatus for transmitting powerto a wireless power receiving apparatus, comprising: a powertransmitting unit adapted to transmit power to the wireless powerreceiving apparatus; a recognition unit adapted to recognize thewireless power receiving apparatus; and a transmitting unit adapted totransmit predetermined charging delay information according to arecognition result of said recognition unit to the wireless powerreceiving apparatus.
 13. The apparatus according to claim 12, furthercomprising: a determination unit adapted to determine, when saidrecognition unit recognizes a new wireless power receiving apparatus,whether or not there is a wireless power receiving apparatus which hasalready received power transmitted from said power transmitting unit.14. The apparatus according to claim 13, wherein when said determinationunit determines that there is the wireless power receiving apparatuswhich has already received power transmitted from said powertransmitting unit, said transmitting unit transmits the predeterminedcharging delay information indicating that the wireless power receivingapparatus is waiting until power reception is started.
 15. The apparatusaccording to claim 12, wherein the predetermined charging delayinformation includes information indicating the number of wireless powerreceiving apparatuses which are waiting for power reception.
 16. Theapparatus according to claim 12, wherein the predetermined chargingdelay information includes information indicating an estimated timeuntil said wireless power transmitting apparatus starts powertransmission.
 17. The apparatus according to claim 13, wherein when saiddetermination unit determines that there is the wireless power receivingapparatus which has already received power transmitted from said powertransmitting unit, said transmitting unit transmits the predeterminedcharging delay information indicating that a plurality of wireless powerreceiving apparatuses are simultaneously receiving power.
 18. Theapparatus according to claim 12, wherein the predetermined chargingdelay information includes information indicating that a time requireduntil completion of charging will be prolonged since a plurality ofwireless power receiving apparatuses are simultaneously receiving power.19. The apparatus according to claim 12, wherein the predeterminedcharging delay information includes information indicating the number ofwireless power receiving apparatuses which are simultaneously receivingpower.
 20. The apparatus according to claim 12, further comprising: asecond display unit adapted to make a display based on the predeterminedcharging delay information.
 21. A control method of a wireless powertransmitting apparatus for transmitting power to a wireless powerreceiving apparatus, comprising: transmitting power to the wirelesspower receiving apparatus; recognizing the wireless power receivingapparatus; and transmitting predetermined charging delay informationaccording to a recognition result in the recognizing to the wirelesspower receiving apparatus.
 22. A computer-readable non-transitorystorage medium storing a computer program for controlling a computer toexecute respective steps of a control method of a wireless powertransmitting apparatus of claim 21.